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I try to buy gas when I'm nearly empty. This way, the margin of error on short-fills is eliminated for a more accurate FE picture.
The exception: before driving holidays (Labor day weekend, 4th of July, etc.) and ozone alert days.
Speaking of Ozone, the more you fill, the more you expose the atmosphere to gasoline vapors, contributing to the problem (even with the vehicle's on-board, and the pump's vapor recovery systems).
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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